.navbar {
    position: relative;
    min-height: 50px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    padding: 15px 0;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .1);
    margin-bottom: 0;
    background-color: rgba(255, 255, 255, .98);
    top: 0;
    border-width: 0 0 1px;
}

.container {
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
    /* border: 1px solid blue; */
    margin-right: -15px;
    margin-left: -15px;
    display: flex;
    justify-content: space-between;
    /* border: 1px solid blueviolet; */
}

.navbar-collapse {
    padding-right: 15px;
    padding-left: 15px;
    overflow-x: visible;
    -webkit-overflow-scrolling: touch;
    border-top: 1px solid transparent;
    -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
    display: inline-block;
    /* border: 1px solid blue; */
}

.nav {
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav>li {
    position: relative;
    display: inline-block;
}

.nav>li>a {
    position: relative;
    display: block;
    padding: 10px 25px;
    line-height: 20px;
    text-decoration: none;
    color: black;
}

.nav>li>a:focus,
.nav>li>a:hover {
    text-decoration: none;
    background-color: #eee;
    color: rgba(59, 190, 122, .9);
}

.button {
    color: #3bbe7a;
    padding: 5px 20px;
    border: 1px solid #3bbe7a;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.slider {
    width: 100%;
    overflow: hidden;
}

.slide {
    display: none;
    width: 100%;
}

.slide img {
    width: 100%;
    height: auto;
}

.welinain {
    text-align: center;
    font-size: 27px;
}

.welinain:nth-of-type(2) {
    margin-top: 100px;
}

.title-comm {
    text-align: center;
    margin: 50px 0 40px
}

.linh25 {
    line-height: 25px;
    font-size: 15px;
    color: gray;
}

.green_line {
    width: 50px;
    height: 2px;
    background-color: #6ac045;
    margin: 10px auto;
}

#imageContainer {
    width: 80%;
    height: 400px;
    position: relative;
    margin: 60px auto;
}

#image {
    width: 100%;
    height: auto;
}

section:nth-of-type(2) {
    margin-top: 100px;
}

section:nth-of-type(2)>div {
    display: inline-block;
    margin-left: 20px;
}

footer {
    background-color: #333;
    color: rgba(102, 102, 102, .8);
    display: flex;
    justify-content: space-between;
    align-items: normal;
    padding: 30px 100px;
}

.footer-duiqi {
    flex-direction: column;
}

.footer-nav {
    display: flex;
}

.footer-nav a {
    margin-top: auto;
    color: rgba(170, 170, 170, .8);
    text-decoration: none;
    margin-right: 20px;
}

.footer-nav a:last-child {
    margin-right: 0;
}

.footer-copy {
    margin-top: 10px;
}

.footer-icons {
    display: flex;
    margin-right: 100px;
}

.footer-icons img {
    margin-left: 30px;
    width: 40px;
}